Hi, I have 3 smoke detectors in my townhome.~2004. The detectors are hardwired and are connected. I am trying to add additional detectors. Connecting to that wire is nearly impossible. Therefore, I need to look at wireless extension. My questions: 1.) Can i replace any of my current detectors with any brand new? While new ones/any brand be compatible? 2.) I like to add detectors n the garage , utility room, possibly in enclosed porch. Common advice is not to use smoke detectors in utility room and garage. Is this still true given todays cars and furnaces? Would a heat detector be the right choice? 3.) What is a good brand that has a good wireless/combo portfolio?

At 12:30 last night my smoke detector when off. I have 6 BRK 7010B (hardwired smoke detector) and 1 BRK SC7010B (smoke/CO2 detector wired together. After checking everywhere for a fire, I pushed the silence button on all of them. 1 made the noise go off for a few seconds by pushing one, but then it came back on. After about 5 minutes it all went off. Another unconnected CO2 detector much closer to the furnace and water heater did nothing, so I don't think it is CO2. I then tested all the detectors. One flashed repeatedly instead of sounding; that is supposed to indicate it is the initiating device. It was the same device that pushing silence temporarily stopped the alarm, so presumably it is the problem. I disconnected it and took the battery out. That is the first problem. I would guess the fix is to the replace the initiating device, even though it is 3 years old. (it is very clean). Any advice on this would be appreciated. The second problem is that the CO2 detector does exactly what it is supposed to do on an test. The rest do not. The are supposed to beep 3 times followed by another 3 beeps. Instead they all breep twice, and then the CO2 detectector beeps 3 times, 3 more times, 4 times, and 4 times, just as it is supposed to. Why don't the other 5 unites, do what they are supposed to do; they is beep two sets of three? My dog didn't like the noise.:mad: Please excuse this; I am very tired and I have a bit of rum; doesn't help typing.